I am looking for the simple robot to carry a PC back to client's home

Not to discourage your desire to get into robotics, but this sounds like a job for a nice little luggage dolly (and a very little bit of manpower) - cheap, light, manueverable, versitle.. all for probably less money and effort than you'd spend just getting a 24v battery setup

Not only that, but unless it's armed, your clients PC will be stolen in mere minutes. Bad for business.

TTFN, Tarkin

I'm amazed that so far no one has asked the OP why the PC is very heavy after he's fixed it.

-- Gordon

the robot is important. The luggage carrier I have it already . It pointless to carry myself for the last two years.

does any one has ready made and would like to information on how to make one?

The kind of robot you seem to be wanting is not in existance. Well, not for under a million, and even then it will be prone to failure on a regular basis.

Joe Dunfee

Think about it. If you could make the robot you envision, you wouldn't have to fix PCs. If you could afford the robot you envision, you wouldn't have to fix PCs.

Think about it. Have you ever seen such a robot? That is, not in a movie?

-- Gordon

It pointless

Maybe you could start with one of those remote controlled so called "robotic" golf caddys ? Just add some way for it to track you (to follow you around) and you're in business. It's the last part that is going to be the real work --- getting it to follow you around.

Here's a link to one on eBay:

Just a thought. JCD

I'm confused about what you want based on what others have posted.

Do you just want some type of powered cart for you to walk with? Or are you asking for a robot that can, on its own, make it's way back to the house of any client in a large city? The first should be easy to build, the second, far too expensive for a PC repair business. I assumed you were looking for the first. Others here seem to have assumed you wanted the second.

For an electric cart, you could do something like this:

Or something like this used for golf:

Or here are a collection of electric shopping cart pushers and electric carts:

It would be simple to buy a few drive motors and wheels and make a powered push cart with a remote control. Or you could get an old electric scooter and modify it.

any suggest on installion of motor on the two black wheels.

steering is important to me.

Method 1

M1 ----- M2

W ( not steering wheel)

or method 2 M1 -------- M1

W ( with steering ablility)

which method and why you choose?

TIA

None of the pictures are showing up for me on the web site.

That would allow you to steer by controlling the speed of each motor. That's a fairly common configuration used in robots (assuming the two wheels are not on a common shaft).

If you put two wheels on a single shaft without a differential the wheels would have to skid to turn. With rubber wheels and a heavy load, that's not going to work very well. With a differential, it would work like a normal car works.

Or you could also drive the third wheel with a motor and leave the main two unpowered. Configure it so you can turn the powered wheel for steering. A simple mechanical link like handle from a wagon could be used so that you don't have to create electronics for steering. Or if you actually need it remotely controlled you could add another motor to rotate the drive wheel for steering.

with the one above one you can also do spins around the middle of the drive axis, you can turn around any point in a line through the drive shaft. if you have matching parts, its easy to do and to track your position.

dan

my friend suggest

"I'd steer it with the stepper motors - faster turning and smaller turning radius. I'd use toothed belts to drive the wheels."

but stepper motor is more expensive than motor.

RFC.

My first Robot( project starts on 1st August 2006), Courage III Main purpose to carry Computer from Client to office or vice-verse platform size

28.5 X 59 cm , wheel 18.5 cm in diameter and 8 cm clearance from ground.

RFC.

This sounds more like a motorized cart than a robot.

Were you planning to guide this "robot" while walking with it, or is it supposed to find your customers by itself?

-- Godon

So you're asking us for help in your homework project?

However, the rest of the posters are right: the problem, as stated, would be very difficult and expensive to solve. Somebody pointed out the possibility of the PC being stolen. I'd worry about the entire robot being stolen.

it is a HOME DIY made, not school home work. but it is my first to build one. I need to build it right and learn from experienced robot builder.

When I completed repair computer and the heavy computer is killing my arms for the last 2 years.

Since....

A. I lived 250 meters from the light railway station, I have to either to carry the computer to the station or using a buggy which desttached from a mountain bike. Then the buggy together with the computer is being pushed into the train component .It pasts the ticket inspector . Tthen continue my journey to client's home. this journey is strict forward path with two secondary schools and pedestrains. But I have to shuttle back and forward to home.

B.on the opposite direction ,from station to home, on arrival home there are a total of about 20 concrete steps. This part is killing me. I really have to carry the computer to home. I intend to make wood railway so that it will safely transport the computer to level ground and able to acroos ONE road , watch out the traffic , then to continue its journey until it reach the station.

This is a repeat journey , develop cycle is depended on knowledge that I dig out from the internet. any type of help is great and valuable.

currently I know little about PWM and I have would to install the motor and make it move manually switch on off.

my purpose is ake it remote control , self intelligent ...etc.

Check this out for general design ideas:

Wayne

the length of the driving shraft from the dc motor is short. The connecting part is also short.

I need to extend it.

Aha, here size DOES matter!

Then do it!